Oleksin [ɔˈlɛkɕin] is a village in the administrative district of Gmina Brańsk, within Bielsk County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 8 kilometres (5 mi) south-east of Brańsk, 22 km (14 mi) west of Bielsk Podlaski, and 50 km (31 mi) south of the regional capital Białystok.